Acetone → HCID 10828369, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 1-(7-tert-butyl-3,3-dimethyl-2,3-dihydrobenzo[b]furan-5-yl)-ethan-1-one (Example 2) (1.07 g, 4.3 mmol) in CH2Cl2 (65 mL) is cooled to -78° C., and diisopropylethylamine (0.97 mL, 5.6 mmol) and trimethylsilyltriflate (1.08 mL, 5.6 mmol) are added sequentially via syringe. The reaction is stirred at -78° C. for 10 min and then is allowed to warm to 24° C. and is stirred at that temperature for 45 min. The solution is once again cooled to -78° C., and acetone (0.54 mL, 4.3 mmol) is added, followed by TiCl4 (1M solution in CH2Cl2, 4.3 mL, 4.3 mmol). After 1 h at -78° C., the reaction mixture is allowed to warm to 24° C. and evaporated. The residue is partioned between MeOH/1N HCl and CH2Cl2. The CH2Cl2 layer is dried (MgSO4), filtered, evaporated, and chromatographed over SiO2 using EtOAc/hexane (1:6), to yield 1-(7-tert-butyl-3,3-dimethyl-2,3-dihydrobenzo[b]furan-5-yl)-3-hydroxy-3-methylbutan-1-one.

Provenance & Evidence